MC34063

® MC34063A MC34063E DC-DC CONVERTER CONTROL CIRCUITS s s s s s s OUTPUT SWITCH CURRENT IN EXCESS OF 1.5A 2% REFERENCE ACCURACY LOW QUIESCENT CURRENT: 2.5mA (TYP.) OPERATING FROM 3V TO 40V FREQUENCY OPERATION TO 100KHz ACTIVE CURRENT LIMITING DIP-8 DESCRIPTION The MC34063A/E series is a monolithic control circuit delivering the main functions for DC-DC voltage converting. The device contains an internal temperature compensated reference, comparator, duty cycle controlled oscillator with an active current limit circuit, driver and high current output switch. Output voltage is adjustable through two external resistors with a 2% reference accuracy. Employing a minimum number of external components the MC34063A/E devices series is designed for Step-Down, Step-Up and Voltage-Inverting applications. SO-8 BLOCK DIAGRAM March 2001 1/15 MC34063A/E ABSOLUTE MAXIMUM RATINGS Symbol V CC V ir V SWC V SWE V CE Vdc I dc I SW P tot T op Power Supply Voltage Comparator Input Voltage Range Switch Collector Voltage Switch Emitter Voltage (VSWC = 40V) Switch Collector toEmitter Voltage Driver Collector Voltage Driver Collector Current Switch Current Power Dissipation at Tamb = 25 oC (for Plastic Package) (for SOIC Package) Operating Ambient Temperature Range (for AC and EC SERIES) (for AB SERIES) (for EB SERIES) Storage Temperature Range Parameter Value 50 -0.3 to 40 40 40 40 40 100 1.5 1.25 0.625 0 to 70 - 40 to 85 - 40 to 125 - 40 to 150 Unit V V V V V V mA A W o o C C o C o T st g...